Lever-Actuated Positioning Jig for Buried Bearing Adjustment
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Solution Overview
Problem
Existing positioning mechanisms, such as those disclosed in Japanese Patent Laid Open Publication No. 2001-68817, are inadequate for fine adjustments of parts buried in a member to be attached, as they cannot reliably adjust the position of a positioning target member by a desired amount in a single operation without impacting the precision structure.
Innovation Solution
A positioning jig with a shaft having intersecting threaded handle attaching portions, a circular support portion, and an applying portion, which pivots about the support portion to allow precise adjustment of the positioning target member within a predetermined plane using operation handles, enabling the application of a non-impact adjusting force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an adjusting member is inserted into a concave portion and impact force is applied to a temporarily fixed bearing, then the bearing position can be adjusted, but the precision structure part may be damaged and the adjustment amount cannot be reliably controlled
Solution Approach 1:
A shaft is introduced as an intermediary lever between the operation handle and the bearing. The shaft transmits the adjusting force from the operation handle to the bearing through a fulcrum mechanism, converting rotational motion into linear pushing motion without direct impact contact.
Solution Approach 2:
The direct impact force application method is replaced with a lever-based mechanical advantage system. By using the shaft as a lever with a fulcrum, a small rotational force applied to the operation handle is amplified into a controlled linear force that pushes the bearing without impact.
2Manufacturing precision
If impact force is applied repeatedly to adjust the bearing position, then the position can be fine-tuned, but the adjustment process becomes time-consuming and the precision parts are at risk of damage
Solution Approach 1:
The lever mechanism with fulcrum provides mechanical advantage, allowing precise position adjustment with a single operation. The shaft acts as a lever that amplifies the small rotational motion of the operation handle into a larger, controlled linear displacement of the bearing, eliminating the need for repeated adjustments.
3Adaptability or versatility
If a conventional positioning mechanism is used for a bearing that is buried in a body portion, then the mechanism cannot be applied, but a new positioning method is needed
Solution Approach 1:
Instead of trying to access the bearing from its buried position, the approach is inverted: the shaft is inserted into the concave portion from the accessible side, and the applying portion extends through the body portion to contact and push the bearing from the opposite side, enabling positioning of buried parts through a simple structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables reliable adjustment of the positioning target member by a desired amount in a single operation without causing harm to the precision structure, allowing for precise positioning without repeated adjustments and minimizing impact on the target member.
Implementation Method 1
the shaft pivots about the support portion as a fulcrum in accordance with respective screwed amounts of the operation handles into the handle attaching portions to dispose the applying portion at any position in the predetermined plane
Data Source
AI summary
There is provided a positioning jig capable of reliably adjusting the position The positioning jig includes a shaft including handle attaching portions at one end, a circular support portion at an intermediate portion, the support portion being at right angles to respective threaded holes of the handle attaching portions and including a larger diameter than that of another portion, and an applying portion at the other end; operation handles screwed to the handle attaching portions; and a base member including pins to be fixed to a mounting member, a support hole fitting around the entire periphery of the support portion, and handle fixing portions for regulating movement of the operation handles, wherein the shaft pivots about the support portion as a fulcrum in accordance with screwed amounts of the operation handles to dispose the applying portion at any position in a predetermined plane.